Quasi-Solid Aqueous Electrolytes for Low-Cost Sustainable Alkali-Metal Batteries.
Adv Mater
; 35(29): e2302280, 2023 Jul.
Article
in En
| MEDLINE
| ID: mdl-37078585
ABSTRACT
Aqueous electrolytes are highly important for batteries due to their sustainability, greenness, and low cost. However, the free water molecules react violently with alkali metals, rendering the high-capacity of alkali-metal anodes unusable. Here, water molecules are confined in a carcerand-like network to build quasi-solid aqueous electrolytes (QAEs) with reduced water molecules' freedom and matched with the low-cost chloride salts. The formed QAEs possess substantially different properties than liquid water molecules, including stable operation with alkali-metal anodes without gas evolution. Specifically, the alkali-metal anodes can directly cycle in a water-based environment with suppressed growth of dendrites, electrode dissolution, and polysulfide shuttle. Li-metal symmetric cells achieved long-term cycling over 7000 h (and over 5000/4000 h for Na/K symmetric cells), and all the Cu-based alkali-metal cells exhibited a Coulombic efficiency of over 99%. Full metal batteries, such as Li||S batteries, attained high Coulombic efficiency, long life (over 4000 cycles), and unprecedented energy density among water-based rechargeable batteries.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Health_economic_evaluation
Language:
En
Journal:
Adv Mater
Journal subject:
BIOFISICA
/
QUIMICA
Year:
2023
Document type:
Article